arm: stm32mp: adapt the command stm32key for STM32MP13x

Change the mask of OTP0 used to close the device on STM32MP
- STM32MP15x: bit 6 of OPT0
- STM32MP13x: 0b111111 = 0x3F for OTP_SECURED closed device

And support the 2 keys for STM32MP13x
- PKHTH : Hash of the 8 ECC Public Keys Hashes Table
          (ECDSA is the authentication algorithm)
- EDMK : Encryption/Decryption Master Key

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>