skiboot v6.7.2 release notes

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
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+.. _skiboot-6.7.2:
+
+==============
+skiboot-6.7.2
+==============
+
+skiboot 6.7.2 was released on Wednesday June 30, 2021. It replaces
+:ref:`skiboot-6.7.1` as the current stable release in the 6.7.x series.
+
+It is recommended that 6.7.2 be used instead of 6.7.1 version due to the
+bug fixes it contains.
+
+Bug fixes included in this release are:
+
+- secvar: fix endian conversion
+
+- secvar/secvar_util: Properly free memory on zalloc fail
+
+- edk2-compat-process.c: Remove repetitive debug print statements
+
+- phb4: Avoid MMIO load freeze escalation on every chip
+
+- phb4: Disable TCE cache line buffer
+
+- hw/imc: Disable only nest_imc devices if pause_microcode() fail
+
+- hw/imc: move imc_init() towards end main_cpu_entry()
+
+- Fix lock error when BT IRQ preempt BT timer