[sw] Add MSECCFGH register to CSR library
[sw] Add MSECCFGH register to CSR library

This CSR represents the high 32 bits of MSECCFG and was added to
Ibex in:

https://github.com/lowRISC/ibex/pull/1310

We should probably autogenerate this list at some point but it
isn't a priority right now.

Signed-off-by: Michael Munday <19411bdeea90f848b8e02e9a1c63a7ce7cc699ea@lowrisc.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan