platform: x86: PMC IPC depends on ACPI

This patch solves:

on x86_64:

when CONFIG_ACPI is not enabled:

../drivers/mfd/intel_soc_pmic_bxtwc.c: In function 'bxtwc_probe':
../drivers/mfd/intel_soc_pmic_bxtwc.c:342:2:
    error: implicit declaration of function 'acpi_evaluate_integer' [-Werror=implicit-function-declaration]
        status = acpi_evaluate_integer(handle, "_HRV", NULL, &hrv);
        ^
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/platform/x86/Kconfig

@@ -914,6 +914,7 @@ config PVPANIC
 
 config INTEL_PMC_IPC
 	tristate "Intel PMC IPC Driver"
+	depends on ACPI
 	---help---
 	This driver provides support for PMC control on some Intel platforms.
 	The PMC is an ARC processor which defines IPC commands for communication