Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Microchip Technology/ATSAME51J19A/SDHC0/PCR#0x0
SDBPWR=OFF
Power Control
SD Bus Power
0 (OFF): Power off
1 (ON): Power on
SD Bus Voltage Select
5 (1V8): 1.8V (Typ.)
6 (3V0): 3.0V (Typ.)
7 (3V3): 3.3V (Typ.)
https://github.com/cmsis-svd/cmsis-svd-data