Move Makefile section from patch (#5909)

There are many changes in this file and its impossible to cover this with a patch for now current and all kernels back
We are using same hack in UWE drivers.

patch/misc/wireless-rtl8723cs/8723cs-Add-a-new-driver-v5.12.2-7-g2de5ec386.20201013_beta.patch

@@ -1189,15 +1189,6 @@ index 5cfabd5376cc..1645e5222ce6 100644
 +source "drivers/staging/rtl8723cs/Kconfig"
 +
  endif # STAGING
-diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
-index f8c3aa9c2418..7409022ac76d 100644
---- a/drivers/staging/Makefile
-+++ b/drivers/staging/Makefile
-@@ -29,3 +29,4 @@ obj-$(CONFIG_PI433)		+= pi433/
- obj-$(CONFIG_XIL_AXIS_FIFO)	+= axis-fifo/
- obj-$(CONFIG_FIELDBUS_DEV)     += fieldbus/
- obj-$(CONFIG_QLGE)		+= qlge/
-+obj-$(CONFIG_RTL8723CS)		+= rtl8723cs/
 diff --git a/drivers/staging/rtl8723cs/Kconfig b/drivers/staging/rtl8723cs/Kconfig
 new file mode 100644
 index 000000000000..78e5f124ca80