Revert "subtree updates"

Needs to go through CI

This reverts commit fc7e7973f3119e2bad511209aa336537dc5ffbed.
diff --git a/meta-arm/meta-arm/recipes-bsp/trusted-firmware-a/trusted-firmware-a_2.8.6.bb b/meta-arm/meta-arm/recipes-bsp/trusted-firmware-a/trusted-firmware-a_2.8.6.bb
new file mode 100644
index 0000000..140faf5
--- /dev/null
+++ b/meta-arm/meta-arm/recipes-bsp/trusted-firmware-a/trusted-firmware-a_2.8.6.bb
@@ -0,0 +1,21 @@
+require trusted-firmware-a.inc
+
+# TF-A v2.8.6
+SRCREV_tfa = "ff0bd5f9bb2ba2f31fb9cec96df917747af9e92d"
+SRCBRANCH = "lts-v2.8"
+
+SRC_URI += "file://rwx-segments.patch"
+
+# Enable passing TOS_FW_CONFIG from FIP package to Trusted OS.
+SRC_URI:append:qemuarm64-secureboot = " \
+            file://add-spmc_manifest-for-qemu.patch \
+            file://feat-qemu-update-abi-between-spmd-and-spmc.patch \
+        "
+
+LIC_FILES_CHKSUM += "file://docs/license.rst;md5=b2c740efedc159745b9b31f88ff03dde"
+
+# mbed TLS v2.28.2
+SRC_URI_MBEDTLS = "git://github.com/ARMmbed/mbedtls.git;name=mbedtls;protocol=https;destsuffix=git/mbedtls;branch=mbedtls-2.28"
+SRCREV_mbedtls = "89f040a5c938985c5f30728baed21e49d0846a53"
+
+LIC_FILES_CHKSUM_MBEDTLS = "file://mbedtls/LICENSE;md5=3b83ef96387f14655fc854ddc3c6bd57"