usb: onboard-hub: Fix return type for regulator APIs

usb: onboard-hub: Fix return type for regulator APIs

Apart from ENOENT observing return value as ENOSYS when
!DM_REGULATOR that's why cover both configurations.
Changed code is not working as operation should be "&&"
not "||" (ret != -ENOENT && ret != -ENOSYS).

Also fix the remove function where the regulator_set_enable_if_allowed()
function is returning an error.

Signed-off-by: Padmarao Begari <padmarao.begari@amd.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/a2d520f14efc30fc28ec59881205e156dabbfcd9.1744350937.git.michal.simek@amd.com