sh3: remove unused cache.c file from being built

The change is similar to commit 994b56616bae ("sh: delete an unused
source file") for SH2, however here the removed cache.c file was
built and included into an image as a dead code.

If it is needed in future the contents can be reused from a similar
arch/sh/cpu/sh4/cache.c file, which is in turn will be moved to
a shared among all core flavours location at arch/sh/lib/cache.c.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/sh/cpu/sh3/Makefile

@@ -12,4 +12,4 @@
 #
 
 extra-y	= start.o
-obj-y	= cpu.o interrupts.o watchdog.o cache.o
+obj-y	= cpu.o interrupts.o watchdog.o

arch/sh/cpu/sh3/cache.c

@@ -1,96 +0,0 @@
-/*
- * (C) Copyright 2007
- * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
- *
- * (C) Copyright 2007
- * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <command.h>
-#include <asm/processor.h>
-#include <asm/io.h>
-
-/*
- * Jump to P2 area.
- * When handling TLB or caches, we need to do it from P2 area.
- */
-#define jump_to_P2()                    \
-  do {                                    \
-    unsigned long __dummy;		\
-    __asm__ __volatile__(			\
-		"mov.l  1f, %0\n\t"     \
-		"or     %1, %0\n\t"     \
-		"jmp    @%0\n\t"        \
-		" nop\n\t"              \
-		".balign 4\n"           \
-		"1:     .long 2f\n"     \
-		"2:"                    \
-		: "=&r" (__dummy)       \
-		: "r" (0x20000000));    \
-  } while (0)
-
-/*
- * Back to P1 area.
- */
-#define back_to_P1()                                    \
-  do {                                                    \
-    unsigned long __dummy;                          \
-    __asm__ __volatile__(                           \
-		"nop;nop;nop;nop;nop;nop;nop\n\t"       \
-		"mov.l  1f, %0\n\t"                     \
-		"jmp    @%0\n\t"                        \
-		" nop\n\t"                              \
-		".balign 4\n"                           \
-		"1:     .long 2f\n"                     \
-		"2:"                                    \
-		: "=&r" (__dummy));                     \
-  } while (0)
-
-#define CACHE_VALID       1
-#define CACHE_UPDATED     2
-
-static inline void cache_wback_all(void)
-{
-	unsigned long addr, data, i, j;
-
-	jump_to_P2();
-	for (i = 0; i < CACHE_OC_NUM_ENTRIES; i++) {
-		for (j = 0; j < CACHE_OC_NUM_WAYS; j++) {
-			addr = CACHE_OC_ADDRESS_ARRAY
-				| (j << CACHE_OC_WAY_SHIFT)
-				| (i << CACHE_OC_ENTRY_SHIFT);
-			data = inl(addr);
-			if (data & CACHE_UPDATED) {
-				data &= ~CACHE_UPDATED;
-				outl(data, addr);
-			}
-		}
-	}
-	back_to_P1();
-}
-
-
-#define CACHE_ENABLE      0
-#define CACHE_DISABLE     1
-
-int cache_control(unsigned int cmd)
-{
-	unsigned long ccr;
-
-	jump_to_P2();
-	ccr = inl(CCR);
-
-	if (ccr & CCR_CACHE_ENABLE)
-		cache_wback_all();
-
-	if (cmd == CACHE_DISABLE)
-		outl(CCR_CACHE_STOP, CCR);
-	else
-		outl(CCR_CACHE_INIT, CCR);
-	back_to_P1();
-
-	return 0;
-}