configs: am62: include android command when android boot image enabled

Ghost Userrequested to merge
souajih/fix_config into integ/ti-u-boot-2021.01

Include Android stuff only if android boot image support was enabled to not have always all bootcmd define in u-boot env and specially in r5 spl u-boot.

Signed-off-by: Guillaume La Roque glaroque@baylibre.com

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