[MTK] How to read/write RF MIPI Data

MIPI data can be read with the AT command below.

AT+ERFTX=12,0,0,1,0,15,28

0, MIPI, 1:BPI
0, read,  1=write
1, mipi port
0, MIPI_RW, 1:MIPI_EXTRW
15, USID
28, MIPI data address(REG=0x1C)