FreeRTOS: Fix thread reg list for Cortex-M7

FreeRTOS: Fix thread reg list for Cortex-M7

This updates the FreeRTOS module to use the M4F FPU stacking also for the
FPV5_SP and FPV5_DP FPUs, which are found on the Cortex-M7. The FPUs are
in fact different than the FPV4_SP found on the M4, but the register
stacking is the same.

Signed-off-by: Frank Dischner <frank.dischner@gmail.com>
Change-Id: I74c45d2cfb55f55e6c557f2450068ad3c2fe9497
Reviewed-on: https://review.openocd.org/c/openocd/+/6939
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>