meta-phosphor: remove duplicate cjson recipe

This recipe stopped being used when one with a higher PV was added
upstream:

openembedded/meta-openembedded@13174e92a9

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: Ifaf2544cd6b41c430666afc82c39b6634147c7cb
diff --git a/meta-phosphor/recipes-support/cjson/cjson_git.bb b/meta-phosphor/recipes-support/cjson/cjson_git.bb
deleted file mode 100644
index 67512ff..0000000
--- a/meta-phosphor/recipes-support/cjson/cjson_git.bb
+++ /dev/null
@@ -1,15 +0,0 @@
-LICENSE = "MIT"
-LIC_FILES_CHKSUM = "file://LICENSE;md5=218947f77e8cb8e2fa02918dc41c50d0"
-
-SRC_URI = "git://github.com/DaveGamble/cJSON.git"
-
-PV = "1.7.6+git${SRCPV}"
-SRCREV = "cbc05de76fbd4dfff17b5626d5cfe9ec922b1f4a"
-
-S = "${WORKDIR}/git"
-
-inherit cmake pkgconfig
-
-FILES:${PN}-dev += "${libdir}/cmake/cJSON/*"
-
-EXTRA_OECMAKE = "-DENABLE_CUSTOM_COMPILER_FLAGS=OFF -DENABLE_TARGET_EXPORT=OFF"