xen: arm64: Add APM implementor id to processor implementers.

This patch updates the list of processor implementers with APM implementor id.

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

xen/arch/arm/setup.c

@@ -64,6 +64,7 @@ static const char * __initdata processor_implementers[] = {
     ['B'] = "Broadcom Corporation",
     ['D'] = "Digital Equipment Corp",
     ['M'] = "Motorola, Freescale Semiconductor Inc.",
+    ['P'] = "Applied Micro",
     ['Q'] = "Qualcomm Inc.",
     ['V'] = "Marvell Semiconductor Inc.",
     ['i'] = "Intel Corporation",