byzantium: Revert "drm: etnaviv: Unmap gems on gem_close"

This will be fixed in mesa (patch there forthcoming)

This reverts commit 695c9204.
2 jobs for undo-etnaviv-gem-map in 64 minutes and 43 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
failed #322887
librem5 allowed to fail
build:aarch64

00:15:30

passed #322888
librem5:arm64
build:deb

01:04:42

 
Name Stage Failure
failed
build:aarch64 Build
  CC [M]  drivers/bluetooth/btrsi.o
LD [M] drivers/hid/hid-picolcd.o
LD [M] drivers/hid/hid-uclogic.o
LD [M] drivers/hid/wacom.o
LD [M] drivers/hid/hid-wiimote.o
AR drivers/hid/built-in.a
LD [M] drivers/bluetooth/hci_uart.o
AR drivers/built-in.a
ERROR: Job failed: exit code 1