[fpv/pinmux] Fix pinmux compile error
[fpv/pinmux] Fix pinmux compile error

This PR fixes pinmux compile error due to the intg_error hierarchy
change.

Signed-off-by: Cindy Chen <399ad771a111eac8923348b1e2af093034e5d4f1@opentitan.org>

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