jlink_spi: add cs=tms option to jlink_spi programmer

Currently, the code assumes the nCS pin of spi nor flash is connected to
either nRESET(pin 15) or nTRST(pin 3). But it is incompatible with the
pinout from official JFlash SPI, whereas the nCS pin is wired to TMS(pin
7).

This commit adds cs=tms option to share the same pinout as JFlash SPI.
It works by toggling TMS in assert_cs and deassert_cs, and sets TMS to
zero in jlink_spi_send_command. The default option is set to cs=reset
for backward compatibility.

Tested on macOS 13.3.1 with JLink and Winbond W25Q128

Change-Id: I0cb467fcc2c403a25f260462de0cd020e7022bb1
Signed-off-by: Jiajie Chen <c@jia.je>
---
M doc/classic_cli_manpage.rst
M jlink_spi.c
2 files changed, 65 insertions(+), 15 deletions(-)