lzma: Port size-checking ulzman() version to coreboot

We've had a second version of ulzma() that would check the input and
output buffer sizes in libpayload for a while now. Since it's generally
never a bad idea to double-check for overruns, let's port it to coreboot
and use it where applicable. (This requires a small fix in the four byte
at a time read optimization we only have in coreboot, since it made the
stream counter hit the end a little earlier than the algorithm liked and
could trigger an assertion.)

BRANCH=None
BUG=None
TEST=Booted Oak, Jerry and Falco.

Change-Id: Id566b31dfa896ea1b991badf5a6ad9d075aef987
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13637
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/include/lib.h

@@ -20,8 +20,9 @@
 #include <stdint.h>
 #include <types.h>
 
-/* Defined in src/lib/lzma.c */
-unsigned long ulzma(unsigned char *src, unsigned char *dst);
+/* Defined in src/lib/lzma.c. Returns decompressed size or 0 on error. */
+size_t ulzma(const void *src, void *dst);
+size_t ulzman(const void *src, size_t srcn, void *dst, size_t dstn);
 
 /* Defined in src/lib/ramtest.c */
 void ram_check(unsigned long start, unsigned long stop);