ARM: dts: socfpga: removal of generic PE1 dts

Remove the older socfpga_arria10_mercury_pe1.dts, since it is duplicate,
the hardware is covered by the combination of Enclustra's .dtsi files.

The older .dts was limited to only the case of having an Enclustra
Mercury+ AA1 on a Mercury+ PE1 base board, booting from sdmmc. This
functionality is provided also by the generic Enclustra dtsi and dts
files, in particular socfpga_arria10_mercury_aa1_pe1_sdmmc.dts. Since
both .dts files cover the same, the older one is to e replaced in
favor of the more modularized approach.

Signed-off-by: Lothar Rubusch <[e-mail]>
Acked-by: Steffen Trumtrar <[e-mail]>
Signed-off-by: Dinh Nguyen <[e-mail]>

arch/arm/boot/dts/intel/socfpga/Makefile

···
 dtb-$(CONFIG_ARCH_INTEL_SOCFPGA) += \
 	socfpga_arria5_socdk.dtb \
 	socfpga_arria10_chameleonv3.dtb \
-	socfpga_arria10_mercury_pe1.dtb \
 	socfpga_arria10_socdk_nand.dtb \
 	socfpga_arria10_socdk_qspi.dtb \
 	socfpga_arria10_socdk_sdmmc.dtb \

arch/arm/boot/dts/intel/socfpga/socfpga_arria10_mercury_pe1.dts

···
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright 2023 Steffen Trumtrar <[e-mail]>
- */
-/dts-v1/;
-#include "socfpga_arria10_mercury_aa1.dtsi"
-
-/ {
-	model = "Enclustra Mercury+ PE1";
-	compatible = "enclustra,mercury-pe1", "enclustra,mercury-aa1",
-		     "altr,socfpga-arria10", "altr,socfpga";
-
-	aliases {
-		ethernet0 = &gmac0;
-		serial0 = &uart0;
-		serial1 = &uart1;
-	};
-};
-
-&gmac0 {
-	status = "okay";
-};
-
-&gpio0 {
-	status = "okay";
-};
-
-&gpio1 {
-	status = "okay";
-};
-
-&gpio2 {
-	status = "okay";
-};
-
-&i2c1 {
-	status = "okay";
-};
-
-&mmc {
-	status = "okay";
-};
-
-&uart0 {
-	status = "okay";
-};
-
-&uart1 {
-	status = "okay";
-};
-
-&usb0 {
-	status = "okay";
-	dr_mode = "host";
-};