bnxt_re/lib: Add uverbs object handle path for CQ/SRQ toggle page

[selvintxavier]

The kernel driver supports two paths for the GET_TOGGLE_MEM ioctl:

- Legacy path (older kernels / older rdma-core): the caller sends
  BNXT_RE_TOGGLE_MEM_TYPE (enum: CQ or SRQ) and BNXT_RE_TOGGLE_MEM_RES_ID
  (the hardware queue ID). The kernel performs an XArray lookup per
  ucontext to find the toggle page.

- New path (new kernel + new rdma-core): the caller sends a uverbs
  object handle (BNXT_RE_TOGGLE_MEM_CQ_HANDLE or
  BNXT_RE_TOGGLE_MEM_SRQ_HANDLE). The kernel resolves the uobject
  directly, with built-in ownership verification and pinning.

During alloc_ucontext, lib  now sets the new request bit
BNXT_RE_COMP_MASK_REQ_UCNTX_TOGGLE_MEM_UOBJ_SUPPORT to advertise
uobj-handle capability. If the kernel responds with
BNXT_RE_UCNTX_CMASK_TOGGLE_MEM_UOBJ_SUPPORT. Based on the negotiated
capability, new path will be selected.

[rleon]

please update this PR

[selvintxavier]

please update this PR

sure will post it today

[selvintxavier]

compilation failure due to the kernel header change
struct mana_ib_create_cq {
__aligned_u64 buf_addr;

•   __u16   flags;
  

•   __u16   comp_mask;
    __u16   reserved0;
    __u32   reserved1;
  

};

@rleon how should I handle this? Can you please help?
Thanks