Revert "arm: bugfix: save_boot_params_default accesses uninitalized stack when -O0"

This reverts commit fa042186b932e9b9ee9a2fd8a04a3acf7c70d224.
It causes build warnings like this:
cpu.c:48:1: warning: -fstack-usage not supported for this target
[enabled by default]

Signed-off-by: Wolfgang Denk <wd@denx.de>

arch/arm/cpu/armv7/cpu.c

@@ -36,15 +36,9 @@
 #include <asm/system.h>
 #include <asm/cache.h>
 #include <asm/armv7.h>
-#include <linux/compiler.h>
 
-void __naked save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
+void save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
 {
-	/*
-	 * Stack pointer is not yet initialized
-	 * Don't save anything to stack even if compiled with -O0
-	 */
-	asm("bx lr");
 }
 
 void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)