configs: enable CONFIG_MMC_PWRSEQ configuration

Enable CONFIG_MMC_PWRSEQ configuration about boards that is using
rockchip_dw_mmc driver.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/configs/chromebit_mickey_defconfig b/configs/chromebit_mickey_defconfig
index ba1215b..c09b63b 100644
--- a/configs/chromebit_mickey_defconfig
+++ b/configs/chromebit_mickey_defconfig
@@ -63,6 +63,7 @@
 CONFIG_CROS_EC=y
 CONFIG_CROS_EC_SPI=y
 CONFIG_PWRSEQ=y
+CONFIG_MMC_PWRSEQ=y
 # CONFIG_SPL_DM_MMC is not set
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_ROCKCHIP=y