[rram_ctrl] remove flash ctrl from EarlGrey

[gautschimi]

As per RFC , Earlgrey will be extended with support for RRAM based non-volatile memory.

This 7th integration PR removes flash_ctrl from Earl Grey and fixes remaining dependencies.

The following is done in this PR:

• flash_ctrl is removed
  • top inst is removed
  • bkdr_loader flash targets are removed
  • adjust several files for the removed alerts/interrupts
  • removed flash targets in DV and verilator TB
• flash_specific tests are excluded:
  • flash_ctrl_mem_protection_test_fpga_cw340_rom_with_fake_keys
  • flash_ctrl_write_clear_test_fpga_cw340_sival_rom_ext
  • flash_ctrl_info_access_lc_*_fpga_cw340_sival
  • flash_ctrl_idle_low_power_test_fpga_cw340_sival_rom_ext
  • flash_ctrl_idle_low_power_test_fpga_cw340_rom_with_fake_keys
  • flash_ctrl_ops_test
  • flash_ctrl_clock_freqs_test
  • flash_ctrl_test
• host side unittests that are not yet ported to mock_rram are excluded:
  • bootstrap_unittest
  • bootstrap_fuzz_test
  • bootstrap_unittest_util
  • bootstrap_fuzzer_util
  • flash_exec_unittest
  • isfb_unittest
• excluded a few flash specific tests for DV
  • chip_prim_tl_access
  • chip_sw_flash_init
  • chip_sw_inject_scramble_seed
• Remaining DV tests are ported to RRAM
  • all_escalation_reset_test
  • chip_sw_rom_e2e_asm_init
• Ported remaining C files to use RRAM instead of flash
  • rom_epmp_test
  • spi_device.c, spi_device_test.c
  • modify_digest.c
  • irq_asm.S
  • rv_dm_ndm_reset_req.c
• removed some stale dependencies in BUILD files
  • that were still pulling in autogenerated files flash_ctrl_c_regs.h, and dif_flash_ctrl.h, flash_ctrl.h
• adds a first version of the rram_exc_handler.
  • needs to be improved and tested: [rram_ctrl] rram_exc_handler #31010
• updates the Earl Grey README.md

[gautschimi]

flash_ctrl is too big, verible lint fails because of too many deletions. The biggest contributors are autogen files:

Lines	File
4,523	pinmux/rtl/pinmux_reg_top.sv
3,590	alert_handler/rtl/alert_handler_reg_top.sv
2,070	pinmux/rtl/pinmux_reg_pkg.sv
2,052	pinmux/doc/registers.md
1,612	top_earlgrey.gen.hjson
1,291	xbar_main/rtl/autogen/xbar_main.sv
1,202	alert_handler/rtl/alert_handler_reg_pkg.sv
1,194	bkdr_loader/rtl/bkdr_loader_regs_reg_top.sv
742	rv_plic/rtl/rv_plic_reg_top.sv

Shall I try to split it up somehow or is it ok? @andreaskurth