obmc-bsp-common: Use xz instead of lzma for initrd

This is more confusing than anything, our squashfs is compressed with xz
(lzma2) and our kernel supports decompressing xz and lzma types of
initrds. Just use the same type of compression for all images.

(From meta-phosphor rev: 282c6e7254ddc4e79d3545b841c091a671d476ce)

Change-Id: I4ecd7e4d72f4a3b3839402934dad959d90d1cec8
Signed-off-by: William A. Kennington III <wak@google.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
index 2026260..4bafeaf 100644
--- a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
+++ b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
@@ -10,7 +10,7 @@
         'mtd-ubi mtd-ubi-tar', \
         'mtd-static mtd-static-tar mtd-static-alltar', d)}"
 
-INITRAMFS_CTYPE ?= "lzma"
+INITRAMFS_CTYPE ?= "xz"
 INITRAMFS_FSTYPES = "cpio.${INITRAMFS_CTYPE}"
 INITRAMFS_IMAGE = "obmc-phosphor-initramfs"
 INITRAMFS_IMAGE_df-obmc-ubi-fs = ""