flash/nor/rp2040: fix setting sp
The num_reg_params parameter of target_run_algorithm() was not
updated when setting "sp" was introduced. Therefore "sp" as the last
register parameter was not passed to a target algo.
Introduce a new helper variable with correct count of register parameters
and use it everywhere needed.
Change-Id: I934a71380783d98917167f1569145808ef23540f
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/7225
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Jonathan Bell <jonathan@raspberrypi.com>