Specify mmc partition to check for uEnv.txt rather than raw device.
Based on patch by Robert Nelson <robertcnelson@gmail.com>
Gbp-Pq: Name am335x-uenv.txt.diff
"loadbootscript=load mmc ${mmcdev} ${loadaddr} boot.scr\0" \
"bootscript=echo Running bootscript from mmc${mmcdev} ...; " \
"source ${loadaddr}\0" \
- "loadbootenv=load mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
+ "loadbootenv=load mmc ${bootpart} ${loadaddr} ${bootenv}\0" \
"importbootenv=echo Importing environment from mmc ...; " \
"env import -t -r $loadaddr $filesize\0" \
"ramargs=setenv bootargs console=${console} " \