[ARM] Support correctly spelled ARMv6KZ architecture names

[Nicholas Clifton]

Hi Matthew,

>> gas/
>> 2015-06-24  Matthew Wahab  <matthew.wahab@arm.com>
>>
>>     * NEWS: Mention corrected spelling of armv6kz.
>>     * config/tc-arm.c (arm_cpus): Replace ARM_ARCH_V6ZK with
>>     ARM_ARCH_V6KZ.
>>     (arm_archs): Likewise. Also add "armv6kz" and "armv6kzt2".
>>     * doc/c-arm.texi: Replace "armv6zk" with "armv6kz".
>>
>> gas/testsuite
>> 2015-06-24  Matthew Wahab  <matthew.wahab@arm.com>
>>
>>     * gas/arm/attr-march-armv6kz.d: New.
>>     * gas/arm/attr-march-armv6kzt2.d: New.
>>
>> include/opcode
>> 2015-06-24  Matthew Wahab  <matthew.wahab@arm.com>
>>
>>     * arm.h (ARM_AEXT_V6ZK): Rename to ARM_AEXT_V6KZ.
>>     (ARM_AEXT_V6ZKT2): Rename to ARM_AEXT_V6KZT2.
>>     (ARM_ARCH_V6ZK): Rename to ARM_ARCH_V6KZ.
>>     (ARM_ARCH_V6ZKT2): Rename to ARM_ARCH_V6KZT2.

Approved - please apply.

Cheers
   Nick

PS.  Sorry for the delay in reviewing.