clk: pistachio: Make it selectable for generic MIPS kernel

We're moving pistachio to generic MIPS kernel. The clk driver
should be avilable to the generic MIPS kernel.

Signed-off-by: Jiaxun Yang <[e-mail]>
Acked-by: Stephen Boyd <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

drivers/clk/Kconfig

···
 source "drivers/clk/meson/Kconfig"
 source "drivers/clk/mstar/Kconfig"
 source "drivers/clk/mvebu/Kconfig"
+source "drivers/clk/pistachio/Kconfig"
 source "drivers/clk/qcom/Kconfig"
 source "drivers/clk/ralink/Kconfig"
 source "drivers/clk/renesas/Kconfig"

drivers/clk/Makefile

···
 obj-y					+= mvebu/
 obj-$(CONFIG_ARCH_MXS)			+= mxs/
 obj-$(CONFIG_COMMON_CLK_NXP)		+= nxp/
-obj-$(CONFIG_MACH_PISTACHIO)		+= pistachio/
+obj-$(CONFIG_COMMON_CLK_PISTACHIO)	+= pistachio/
 obj-$(CONFIG_COMMON_CLK_PXA)		+= pxa/
 obj-$(CONFIG_COMMON_CLK_QCOM)		+= qcom/
 obj-y					+= ralink/

drivers/clk/pistachio/Kconfig

···
+# SPDX-License-Identifier: GPL-2.0
+
+config COMMON_CLK_PISTACHIO
+	bool "Support for IMG Pistachio SoC clock controllers"
+	depends on MIPS || COMPILE_TEST
+	help
+	  Support for the IMG Pistachio SoC clock controller.
+	  Say Y if you want to include clock support.