timers: atmel_tcb: introduce CONFIG_SPL_ATMEL_TCB

This commit allows the ATMEL_TCB driver to be unselected in SPL and be
selected in u-boot proper. The SPL can use a different timer.
By having a separate Kconfig for ATMEL_TCB in SPL, the size of the SPL
decreases by 1 KByte.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 672746a..68e90b8 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -98,6 +98,14 @@
 	  Select this to enable the use of the timer counter as a monotonic
 	  counter.
 
+config SPL_ATMEL_TCB_TIMER
+	bool "Atmel timer counter support in SPL"
+	depends on SPL_TIMER
+	depends on ARCH_AT91
+	help
+	  Select this to enable the use of the timer counter as a monotonic
+	  counter in SPL.
+
 config CADENCE_TTC_TIMER
 	bool "Cadence TTC (Triple Timer Counter)"
 	depends on TIMER
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index 17f9f1d..ae01a25 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -8,7 +8,7 @@
 obj-$(CONFIG_ARC_TIMER)	+= arc_timer.o
 obj-$(CONFIG_AST_TIMER)	+= ast_timer.o
 obj-$(CONFIG_ATMEL_PIT_TIMER) += atmel_pit_timer.o
-obj-$(CONFIG_ATMEL_TCB_TIMER) += atmel_tcb_timer.o
+obj-$(CONFIG_$(SPL_)ATMEL_TCB_TIMER) += atmel_tcb_timer.o
 obj-$(CONFIG_CADENCE_TTC_TIMER)	+= cadence-ttc.o
 obj-$(CONFIG_DESIGNWARE_APB_TIMER)	+= dw-apb-timer.o
 obj-$(CONFIG_MPC83XX_TIMER) += mpc83xx_timer.o