Swift:  Bump MRW version

Pick up a change that assigns types to the panel and VRM cards so
gen_openpower_fru.pl can find them when looking for VPD.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ib0755dd575ec497e3a37927a5c4a08560146f6b1
diff --git a/meta-witherspoon/conf/machine/swift.conf b/meta-witherspoon/conf/machine/swift.conf
index 6b5b7ce..bca1ed3 100644
--- a/meta-witherspoon/conf/machine/swift.conf
+++ b/meta-witherspoon/conf/machine/swift.conf
@@ -5,7 +5,7 @@
 PHOSPHOR_MRW_LICENSE = "Apache-2.0"
 PHOSPHOR_MRW_LIC_FILES_CHKSUM = "file://LICENSE;md5=e3fc50a88d0a364313df4b21ef20c29e"
 PHOSPHOR_MRW_URI = "git://git@github.com/open-power/swift-xml;protocol=ssh"
-PHOSPHOR_MRW_REV = "661fdc993683bd40df4e5f11463ba51da702c55b"
+PHOSPHOR_MRW_REV = "7880e778af3fca75f46aa3e94f7e9971a6ddbb1f"
 
 # 128MB flash size
 FLASH_SIZE = "131072"