[COMMITTERS] Update committers list
[COMMITTERS] Update committers list

Add Jade Philipoom to the committers list as agreed by the
technical committee.

Thanks for all your contributions Jade!

Signed-off-by: Michael Munday <19411bdeea90f848b8e02e9a1c63a7ce7cc699ea@lowrisc.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan