nios2: Correct guard #defines in bits/kernel_types.h
nios2: Correct guard #defines in bits/kernel_types.h

The guards in posix_types.h are called _ASM_NIOS2_POSIX_TYPES_H, so
correctly use them here. Otherwise we wont be able to build uClibc
with headers exported from the current nios2 kernel.

Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc