pflash: Rename *CFI_PFLASH* to *PFLASH_CFI*

pflash: Rename *CFI_PFLASH* to *PFLASH_CFI*

pflash_cfi01.c and pflash_cfi02.c start their identifiers with
pflash_cfi01_ and pflash_cfi02_ respectively, except for
CFI_PFLASH01(), TYPE_CFI_PFLASH01, CFI_PFLASH02(), TYPE_CFI_PFLASH02.
Rename for consistency.

Suggested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20190308094610.21210-5-armbru@redhat.com>
(cherry picked from commit e7b6274197c5f096860014ca750544d6aca0b9b9)
*prereq for 3a283507
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>