Documentation: embargoed-hardware-issues.rst: Add myself for Power

Unfortunately Anton has left IBM. Add myself as the contact for Power,
until someone else volunteers.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20240322103840.668746-1-mpe@ellerman.id.au
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by Michael Ellerman and committed by Greg Kroah-Hartman 156539fd a90bca22

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Documentation/process/embargoed-hardware-issues.rst
··· 252 252 AMD Tom Lendacky <thomas.lendacky@amd.com> 253 253 Ampere Darren Hart <darren@os.amperecomputing.com> 254 254 ARM Catalin Marinas <catalin.marinas@arm.com> 255 - IBM Power Anton Blanchard <anton@linux.ibm.com> 255 + IBM Power Michael Ellerman <ellerman@au.ibm.com> 256 256 IBM Z Christian Borntraeger <borntraeger@de.ibm.com> 257 257 Intel Tony Luck <tony.luck@intel.com> 258 258 Qualcomm Trilok Soni <quic_tsoni@quicinc.com>