fixed nokia platform m0 asic mismatch (#12148)

changed the platform device name under nokia directory; we now need to specify marvell armhf/arm64 to provide more accurate platform identity. otherwise onie discovery won't recognize the asic being installed.

Why I did it
when we load images using onie discovery, the process was failing because of marvell ASIC mismatch

How I did it
replace the platform asic with marvell-armhf under 7215

How to verify it
load a new image using http server and verify that the image can be loaded successfully

device/nokia/armhf-nokia_ixs7215_52x-r0/platform_asic

@@ -1 +1 @@
-marvell
+marvell-armhf