net: wireless: redpine: lower the power save periods

By lowering the power save periods the interface is responsive during
power_save. It still sufers from low throughput.

Signed-off-by: Angus Ainslie <angus@akkea.ca>
3 jobs for redpine-new-driver in 77 minutes and 17 seconds
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passed build:aarch64 #322248
librem5

00:15:02

passed build:deb #324296
librem5:arm64

01:02:14

passed build:deb #322249
librem5:arm64

01:00:22