mmc: meson-mx-sdhc: Fix building with CONFIG_MMC_MESON_MX_SDHC=m

For an x86_64 allmodconfig build Stephen reports that building
meson-mx-sdhc-clkc.o warns that MODULE_LICENSE is missing and when
linking meson_mx_sdhc_register_clkc cannot be found.

Compile the MMC controller driver together with the build-in clock
controller driver into one module rather than using two separate
modules to fix these issues.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20200518060811.1499962-1-martin.blumenstingl@googlemail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 8bcb420..8f45925 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -68,7 +68,8 @@
 obj-$(CONFIG_MMC_USHC)		+= ushc.o
 obj-$(CONFIG_MMC_WMT)		+= wmt-sdmmc.o
 obj-$(CONFIG_MMC_MESON_GX)	+= meson-gx-mmc.o
-obj-$(CONFIG_MMC_MESON_MX_SDHC)	+= meson-mx-sdhc-clkc.o meson-mx-sdhc.o
+meson-mx-sdhc-objs 		:= meson-mx-sdhc-clkc.o meson-mx-sdhc-mmc.o
+obj-$(CONFIG_MMC_MESON_MX_SDHC)	+= meson-mx-sdhc.o
 obj-$(CONFIG_MMC_MESON_MX_SDIO)	+= meson-mx-sdio.o
 obj-$(CONFIG_MMC_MOXART)	+= moxart-mmc.o
 obj-$(CONFIG_MMC_SUNXI)		+= sunxi-mmc.o
diff --git a/drivers/mmc/host/meson-mx-sdhc.c b/drivers/mmc/host/meson-mx-sdhc-mmc.c
similarity index 100%
rename from drivers/mmc/host/meson-mx-sdhc.c
rename to drivers/mmc/host/meson-mx-sdhc-mmc.c