Gustavo Pimentel seems to have left Synopsys, so his email is bouncing.
And there is no indication from him expressing willingless to continue
contributing to the driver.

Drop him from the MAINTAINERS entry and add a CREDITS entry.

Link: https://lore.kernel.org/r/20240326085130.12487-1-manivannan.sadhasivam@linaro.orgSigned-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
[bhelgaas: add CREDITS entry]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>