mtd: lpddr_cmds: remove unused words variable

clang with W=1 reports
drivers/mtd/lpddr/lpddr_cmds.c:409:31: error: variable
  'words' set but not used [-Werror,-Wunused-but-set-variable]
        int ret, wbufsize, word_gap, words;
                                     ^
This variable is not used so remove it.

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230328000620.1778033-1-trix@redhat.com