staging: typec: fix endianness mismatch identified by sparse

Eliminate the following sparse warnings:

tcpci.c:291:38: warning: incorrect type in argument 1 (different base types)
tcpci.c:291:38:    expected unsigned short [unsigned] [usertype] header
tcpci.c:291:38:    got restricted __le16 const [usertype] header
tcpci.c:296:16: warning: incorrect type in assignment (different base types)
tcpci.c:296:16:    expected unsigned int [unsigned] header
tcpci.c:296:16:    got restricted __le16
tcpci.c:394:28: warning: incorrect type in assignment (different base types)
tcpci.c:394:28:    expected restricted __le16 [usertype] header
tcpci.c:394:28:    got unsigned int [unsigned] [addressable] reg

Signed-off-by: Gabriel Somlo <gsomlo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>