Support boot from Realtek USB MMC

I stumbled upon discussion about needing drivers builtin to the kernel, not as modules, for booting from MMC card plugged into a socket with Realtek interface chip:

https://github.com/puppylinux-woof-CE/woof-CE/issues/1835

I looked at the config file I am using for EasyOS, and yes, do need to change some from module to builtin. These are the one needed to be changed from "m" to "y":

CONFIG_MISC_RTSX_USB
CONFIG_MMC_REALTEK_PCI
CONFIG_MMC_REALTEK_USB

Right now, compiling the 5.4.84 kernel with these changes. No firmware required. 

Tags: easy