nrf_qspi_nor.c Incorrect value used for checking start of RAM address space

[hakonfam]

nrf_qspi_nor.c checks incorrect value when deciding if data is stored in FLASH or RAM.

	if (size < 4U) {
		res = write_sub_word(dev, addr, src, size);
	} else if (((uintptr_t)src < CONFIG_SRAM_BASE_ADDRESS)) {
		res = write_from_nvmc(dev, addr, src, size);
	} else {
		res = nrfx_qspi_write(src, size, addr);
		qspi_wait_for_completion(dev, res);
	}

CONFIG_SRAM_BASE_ADDRESS is the base address of the image SRAM, and not the base of actual HW SRAM.

The devicetree node sram0 should be used instead.

This impacts trustzone-enabled devices where CONFIG_SRAM_BASE_ADDRESS does not point to the same address as the sram0 devicetree node (ie actual bottom of HW SRAM).