Fix only configuring portexpander with MXC_ASSERT enabled

Merged rahix requested to merge rahix/fix-portexpander-init into master

When MXC_ASSERT is disabled, the portexpander_config() call is not compiled into the bootloader which leads to the portexpander not being setup correctly and thus neither the screen turns on nor does the button to switch into MSC mode work correctly (bootloader always goes into MSC mode).

Fix this by moving the portexpander_config() call outside the MXC_ASSERT and only keep the return value check inside. Additionally fix the pull-up/pull-down selection in portexpander_config() not being set correctly.

Fixes #171 (closed)

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