configs: sam9x60ek: enable CONFIG_CPU

Enable CONFIG_CPU for SAM9X60EK configs.

Reported-by: Eugen Hristev <eugen.hristev@microchip.com>
Fixes: a64862284f65 ("clk: at91: sam9x60: add support compatible with
CCF")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/configs/sam9x60ek_nandflash_defconfig b/configs/sam9x60ek_nandflash_defconfig
index 14a8094..67924fc 100644
--- a/configs/sam9x60ek_nandflash_defconfig
+++ b/configs/sam9x60ek_nandflash_defconfig
@@ -49,6 +49,7 @@
 CONFIG_CLK_AT91=y
 CONFIG_AT91_GENERIC_CLK=y
 CONFIG_AT91_SAM9X60_PLL=y
+CONFIG_CPU=y
 CONFIG_AT91_GPIO=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_AT91=y