src/flash/nor: flash driver for RSL10

Add new flash driver for internal flash of onsemi RSL10 device.

Valgrind-clean. Clang AddressSanitizer shows no errors.

Signed-off-by: Toms Stūrmanis <toms.sturmanis@gmail.com>
Change-Id: I8030542cb9805e94f56d7a69404cef5d88d6dd5a
Reviewed-on: https://review.openocd.org/c/openocd/+/7115
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

contrib/loaders/flash/rsl10/Makefile

@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+BIN2C = ../../../../src/helper/bin2char.sh
+
+CROSS_COMPILE ?= arm-none-eabi-
+
+CC=$(CROSS_COMPILE)gcc
+OBJCOPY=$(CROSS_COMPILE)objcopy
+OBJDUMP=$(CROSS_COMPILE)objdump
+
+CFLAGS = -static -nostartfiles -mlittle-endian -Wa,-EL
+
+all: rom_launcher.inc
+
+.PHONY: clean
+
+%.elf: %.S
+	$(CC) $(CFLAGS) $< -o $@
+
+%.lst: %.elf
+	$(OBJDUMP) -S $< > $@
+
+%.bin: %.elf
+	$(OBJCOPY) -Obinary $< $@
+
+%.inc: %.bin
+	$(BIN2C) < $< > $@
+
+clean:
+	-rm -f *.elf *.lst *.bin *.inc