README.hardware.md: add myself to genericarm64 maintainers

I will be testing genericarm64 images on AMD Kria KV260 devices.

Cc: Bill Mills <bill.mills@linaro.org>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
(From meta-yocto rev: 32eadeec5f08f41a1098fb95e66c5f05c553d43d)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto-bsp/README.hardware.md

@@ -136,6 +136,7 @@ compliant boards with preinstalled firmware.
 The genericarm64 MACHINE is currently tested on the following platforms:
 
   * Texas Instruments BeaglePlay
+  * AMD Kria KV260
 
 The images built are EFI bootable disk images and can be written directly to a
 SD card for booting, for example.
@@ -147,6 +148,7 @@ firmware (note that this firmware will _not_ boot on real hardware), then use
 
 Maintainers:
 * Ross Burton <Ross.Burton@arm.com>
+* Mikko Rapeli <mikko.rapeli@linaro.org>
 
 Texas Instruments Beaglebone (beaglebone-yocto)
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