clk: at91: add at91sam9260 PMC driver

Add a driver for the PMC clocks of the at91sam9260, at91sam9261,
at91am9263 and at91sam9g20 SoCs.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
[sboyd@kernel.org: Make i signed to fix signedness bug]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/at91/Makefile

@@ -14,5 +14,6 @@ obj-$(CONFIG_HAVE_AT91_SMD)		+= clk-smd.o
 obj-$(CONFIG_HAVE_AT91_H32MX)		+= clk-h32mx.o
 obj-$(CONFIG_HAVE_AT91_GENERATED_CLK)	+= clk-generated.o
 obj-$(CONFIG_HAVE_AT91_I2S_MUX_CLK)	+= clk-i2s-mux.o
+obj-$(CONFIG_SOC_AT91SAM9) += at91sam9260.o
 obj-$(CONFIG_SOC_SAMA5D4) += sama5d4.o
 obj-$(CONFIG_SOC_SAMA5D2) += sama5d2.o