generic: lzma-loader: fix cache invalidation

The current code only partially invalidates both caches
because the cache size and cache-line size values are
incorrectly passed to the C code.

Fix the assembly code to pass the arguments in the correct
order.

Tested on RB532.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 49056