readme: Missing counter names

Improve troubleshooting section by adding a possible solution to missing
counter names within the trace viewer.

Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Reviewed-by: Rohan Garg <rohan.garg@collabora.com>
3 jobs for missing-counter-names in 1 minute and 37 seconds (queued for 1 second)
Status Job ID Name Coverage
  Check
passed #5339214
clang-format

00:00:09

 
  Build
passed #5339216
aarch64
aarch64

00:01:27

passed #5339215
kvm
x86_64

00:00:46