configs: j721s2_evm_a72_defconfig: fix the bootcmd

Remove the main_cpsw0_qsgmii_phyinit variable from the boot
command as there is no ethernet firmware in j721s2.

Fixes: 8886341aa670 ('configs: j721s2_evm_a72_defconfig: Add A72 specific defconfig')
Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
1 file changed