u need reduce ur emmc speed in dtb file, i got same errors in my s905w box. in pure kernel speed is 2000000, in balbes150 it reduced to 1000000, but i reduce it to 500000 and installed armbian to emmc successfully.
I have a amlogic TV box , and find it use rtl8822bs.
this module has a UART Bluetooth , the config needs
(use uart_A ,almost all realtek UART Bluetooth module need it)
(to pull up GPIOX_17 pin in terminal, it's a BT_EN pin).
has been tested on a recompile kernel , bluetooth can work , hope you can add it
EDIT: CONFIG_GPIO_SYSFS is don't need to add , I write a C program to do this. So only need to add CONFIG_BT_HCIUART_3WIRE .
I'm using meson-gxl-s805x-p241.dts