ARM: imx: fix imx8m dependencies

Selecting ARM_GIC_V3 on non-CP15 processors leads to build failures
like

arch/arm/include/asm/arch_gicv3.h: In function 'write_ICC_AP1R3_EL1':
arch/arm/include/asm/arch_gicv3.h:36:40: error: 'c12' undeclared (first use in this function)
36 | #define __ICC_AP1Rx(x) __ACCESS_CP15(c12, 0, c9, x)
| ^~~

Add a dependency to only enable the gic driver when building for
at an ARMv7 target, which is the closes approximation to the ARMv8
processor that is actually in this chip.

Fixes: fc40200ebf82 ("soc: imx: increase build coverage for imx8m soc driver")
Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

drivers/soc/imx/Kconfig

···
 	depends on ARCH_MXC || COMPILE_TEST
 	default ARCH_MXC && ARM64
 	select SOC_BUS
-	select ARM_GIC_V3 if ARCH_MXC
+	select ARM_GIC_V3 if ARCH_MXC && ARCH_MULTI_V7
 	help
 	  If you say yes here you get support for the NXP i.MX8M family
 	  support, it will provide the SoC info like SoC family,