[HEXAGON] QCOM hexagon library (qhl)

[avquicinc]

This patch adds Qualcomm's Hexagon Library support.
Changes done for:

• linking QHL library from HexagonSDK
• compiling QHL wrapper for QHL library
• redirecting tir.<ops> to QHL library. For <ops> in { ceil, cos, exp, floor, sin, sigmoid, sqrt, tan, tanh, pow, }
• This change is made in context of implementing tanh fp16 slice op
• To separate out QHL changes from tanh op implementation, there will be a subsequent PR for tanh fp16 slice op that will use the QHL library changes.

cc @mehrdadh

[avquicinc]

Hi @kparzysz-quic,
This patch contains QHL changes. Can you please review it.
Thank you.