nv_sma_spi: Add Nvidia SMA Programmer

Add initial support for System Management Agent (SMA) programmer.
SMA is a SOC which is working as a side band management on Nvidia
server board. One of its functionality is to flash firmware to other
components.

Test:
1. Build flashrom with this change.
2. Run operation: erase, write, read
3. All operations completed with expected performance.

NV_SMA_SPI has been tested with the following SPI flash models:

w25r128jw
w25r64jv
w25q16v

Change-Id: I6b2522788db3dcee2b30faff29f605cede8c0eaf
Co-Developed-by: Gilbert Chen <gilbertc@nvidia.com>
Co-Developed-by: Willie Thai <wthai@nvidia.com>
Signed-off-by: Willie Thai <wthai@nvidia.com>
Signed-off-by: Gilbert Chen <gilbertc@nvidia.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/88816
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>

meson.build

@@ -469,6 +469,13 @@ programmer = {
     'test_srcs' : files('tests/nicrealtek.c'),
     'flags'   : [ '-DCONFIG_NICREALTEK=1' ],
   },
+  'nv_sma_spi' : {
+    'deps'    : [ libusb1 ],
+    'groups'  : [ group_usb, group_external ],
+    'srcs'    : files('nv_sma_spi.c', 'usb_device.c'),
+    'test_srcs' : files('tests/nv_sma_spi.c'),
+    'flags'   : [ '-DCONFIG_NV_SMA_SPI=1' ],
+  },
   'ogp_spi' : {
     'systems' : systems_hwaccess,
     'deps'    : [ libpci ],