MA-19811-16 arm64: Do not select CLKSRC_IMX_TPM by ARCH_MXC

Give a chance to build CLKSRC_IMX_TPM as module.

Fixes: f4775509 ("LF-4481-03 arm64: mxc: select the tpm timer by default")
Signed-off-by: Jindong Yue <jindong.yue@nxp.com>
Change-Id: I9c2cb1915f6f802cc920a09df114c8be6c4bd401

arch/arm64/Kconfig.platforms

@@ -187,7 +187,6 @@ config ARCH_MXC
 	select PM
 	select PM_GENERIC_DOMAINS
 	select SOC_BUS
-	select CLKSRC_IMX_TPM
 	help
 	  This enables support for the ARMv8 based SoCs in the
 	  NXP i.MX family.

drivers/clocksource/Kconfig

@@ -621,6 +621,7 @@ config CLKSRC_IMX_GPT
 
 config CLKSRC_IMX_TPM
 	bool "Clocksource using i.MX TPM" if COMPILE_TEST
+	default ARCH_MXC
 	depends on (ARM || ARM64) && CLKDEV_LOOKUP
 	select CLKSRC_MMIO
 	select TIMER_OF