timer: atmel_tcb_timer: add atmel_tcb driver

Add a driver for the timer counter block that can be found on sama5d2.
This driver will be used when booting under OP-TEE since the pit timer
which is part of the SYSC is secured. Channel 1 & 2 are configured to
be chained together which allows to have a 64bits counter.

Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>
diff --git a/arch/arm/mach-at91/armv7/Makefile b/arch/arm/mach-at91/armv7/Makefile
index 246050b..f395b55 100644
--- a/arch/arm/mach-at91/armv7/Makefile
+++ b/arch/arm/mach-at91/armv7/Makefile
@@ -14,9 +14,11 @@
 ifndef CONFIG_$(SPL_TPL_)SYSRESET
 obj-y	+= reset.o
 endif
+ifneq ($(CONFIG_ATMEL_TCB_TIMER),y)
 ifneq ($(CONFIG_ATMEL_PIT_TIMER),y)
 ifneq ($(CONFIG_MCHP_PIT64B_TIMER),y)
 # old non-DM timer driver
 obj-y += timer.o
 endif
 endif
+endif