realtek_mst_i2c_spi.c: Update PAGE_SIZE and fix write

Update the PAGE_SIZE to 128 as fix r/w on different devices,
also fix the write page mapping for it.

BUG=b:147402710
TEST=build and run flashrom to read&write on multiple devices

Signed-off-by: Shiyu Sun <sshiyu@chromium.org>
Change-Id: Ifcdd3548519eb37440e67fcf6206279cff05b159
Reviewed-on: https://review.coreboot.org/c/flashrom/+/48840
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
1 file changed