arm: omap-common: do not build timer when CONFIG_TIMER defined

To prepare timer driver to DM/DT conversion do not build the
exiting timer driver when CONFIG_TIMER is defined. But since
omap's SPL doesn't support DM yet so built timer driver only for
SPL build when CONFIG_TIMER is defined.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/cpu/armv7/omap-common/Makefile

@@ -6,7 +6,13 @@
 #
 
 obj-y	:= reset.o
+ifeq ($(CONFIG_TIMER),)
 obj-y	+= timer.o
+else
+ifdef CONFIG_SPL_BUILD
+obj-y	+= timer.o
+endif
+endif
 obj-y	+= utils.o
 
 ifneq ($(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX),)