arm64: Enable ARCH_HAS_RESET_CONTROLLER for ARCH_BRCMSTB

Allow the use of reset controllers on ARCH_BRCMSTB such as the recently
introduced RESET_BRCMSTB driver.
Signed-off-by: NJim Quinlan <jim2101024@gmail.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

arch/arm64/Kconfig.platforms

@@ -65,6 +65,7 @@ config ARCH_BITMAIN
 
 config ARCH_BRCMSTB
 	bool "Broadcom Set-Top-Box SoCs"
+	select ARCH_HAS_RESET_CONTROLLER
 	select BCM7038_L1_IRQ
 	select BRCMSTB_L2_IRQ
 	select GENERIC_IRQ_CHIP