rampis: use lzma-loader for ZTE MF283+

rampis: use lzma-loader for ZTE MF283+

Without that, after merging support to master, the device fails to boot
due to LZMA decompression error:

3: System Boot system code via Flash.
## Booting image at bc080000 ...
raspi_read: from:80000 len:40
.   Image Name:   MIPS OpenWrt Linux-5.4.99
   Created:      2021-02-25  23:35:00 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    1786664 Bytes =  1.7 MB
   Load Address: 80000000
   Entry Point:  80000000
raspi_read: from:80040 len:1b4328
............................   Verifying Checksum ... OK
   Uncompressing Kernel Image ... LZMA ERROR 1 - must RESET board to recover

Use lzma-loader to fix it.

Fixes: 59d065c9f81c ("ramips: add support for ZTE MF283+")
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>