nds32: dts: Fix mmc node compatible string

nds32: dts: Fix mmc node compatible string

In the two commits:
7f3aed7c0f5fc966b0d1a1ae02acd9e5bc3cf84d
mmc: ftsdc010_mci: Sync compatible with DT mmc node

8da96f5f08a930a1cefc45c848f72f10c3936f4e
riscv: dts: Sync DT with Linux Kernel

ftsdc010_mci's compatible has been modified as
"andestech,atfsdc010" for RISC-V synchronization.
But ae3xx.dts and ag101p.dts which are used for
nds32 adp-ae3xx and adp-ag101p platforms did not
be modified correctly at that time. It will cause
mmc detection failure. Fix it here.

Signed-off-by: Rick Chen <rick@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>