clk: keystone: TI_SCI_PROTOCOL is needed for clk driver

CONFIG_COMPILE_TEST allows building a configuration without
TI_SCI_PROTOCOL, which then fails to link:

drivers/clk/keystone/sci-clk.o: In function `ti_sci_clk_probe':
sci-clk.c:(.text.ti_sci_clk_probe+0x4c): undefined reference to `devm_ti_sci_get_handle'

This makes it a hard dependency. Right now, that means we can't
actually compile-test the driver unless ARCH_KEYSTONE is set as
well, but we can fix that by allowing TI_MESSAGE_MANAGER to
be selected for COMPILE_TEST as well.

Fixes: b745c0794e2f ("clk: keystone: Add sci-clk driver support")
Signed-off-by: Arnd Bergmann <[e-mail]>
Acked-by: Tero Kristo <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/keystone/Kconfig

···
 config TI_SCI_CLK
 	tristate "TI System Control Interface clock drivers"
 	depends on (ARCH_KEYSTONE || COMPILE_TEST) && OF
-	default TI_SCI_PROTOCOL
+	depends on TI_SCI_PROTOCOL
+	default ARCH_KEYSTONE
 	---help---
 	  This adds the clock driver support over TI System Control Interface.
 	  If you wish to use clock resources from the PMMC firmware, say Y.