clk: ti: Allow COMPILE_TEST to build selected drivers

The arch independent drivers can be build testeed with
COMPILE_TEST. Let's allow that for drivers/clk/ti.

Signed-off-by: Tony Lindgren <[e-mail]>
Signed-off-by: Michael Turquette <[e-mail]>

drivers/clk/Makefile

···
 obj-$(CONFIG_ARCH_STI)			+= st/
 obj-$(CONFIG_ARCH_SUNXI)		+= sunxi/
 obj-$(CONFIG_ARCH_TEGRA)		+= tegra/
-obj-$(CONFIG_ARCH_OMAP2PLUS)		+= ti/
+obj-y					+= ti/
 obj-$(CONFIG_ARCH_U8500)		+= ux500/
 obj-$(CONFIG_COMMON_CLK_VERSATILE)	+= versatile/
 obj-$(CONFIG_X86)			+= x86/

drivers/clk/ti/Makefile

···
+ifeq ($(CONFIG_ARCH_OMAP2PLUS), y)
+
 obj-y					+= clk.o autoidle.o clockdomain.o
 clk-common				= dpll.o composite.o divider.o gate.o \
 					  fixed-factor.o mux.o apll.o \
···
 ifdef CONFIG_ATAGS
 obj-$(CONFIG_ARCH_OMAP3)                += clk-3xxx-legacy.o
 endif
+
+endif	# CONFIG_ARCH_OMAP2PLUS
 
 obj-$(CONFIG_COMMON_CLK_TI_ADPLL)	+= adpll.o