[dts] [PATCH] meson compile: Improve compile times

[Tu, Lijuan]

> Increased compile timeout
> Removed workers parameter from ninja compilation command
> 
> After a review of CI metrics, we noticed that dts runtimes had increased greatly
> over the last few months. A review of recent logs showed timeouts for
> compiling dpdk. Upon review, we discovered that, if the "dut_cores" parameter
> is not set in conf/crbs.cfg, then dts uses the default value, which is a single core,
> as the core list. The number of cores in this list was then used the number of
> workers for ninja. This causes DTS to attempt to compile DPDK serially, resulting
> in greatly increased compile times. The IOL's development machine saw a 30x
> compile speed increase from the included changes.
> 
> Signed-off-by: Owen Hilyard <ohilyard at iol.unh.edu>

Applied, thanks