mailbox: Remove depends on COMPILE_TEST for BCM_FLEXRM_MBOX

The Broadcom FlexRM mailbox driver uses platform MSI support but
not all ARCHs provide asm/msi.h. Due to this, we get compilation
error in Broadcom FlexRM mailbox driver via linux/msi.h on ARCHs
which lack asm/msi.h.

This patch removes "depends on COMPILE_TEST" for Kconfig option
BCM_FLEXRM_MBOX so that Broadcom FlexRM mailbox driver is only
compiled for ARM64.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/Kconfig

@@ -154,7 +154,7 @@ config BCM_PDC_MBOX
 
 config BCM_FLEXRM_MBOX
 	tristate "Broadcom FlexRM Mailbox"
-	depends on ARM64 || COMPILE_TEST
+	depends on ARM64
 	depends on HAS_DMA
 	select GENERIC_MSI_IRQ_DOMAIN
 	default ARCH_BCM_IPROC