build(deps): bump third_party/litex-boards from `ea58ef9` to `19bce66`

[dependabot[bot]]

Bumps third_party/litex-boards from ea58ef9 to 19bce66.

Commits

• 19bce66 Add initial LimeSDR XTRX Platform support (Adapted from Fairwaves XTRX).
• 7a0ee7f platforms/fairwaves_xtrx: Change rst to rst_n (active low).
• 5a25a4e alinx_axau15p: Switch to OpenFPGALoader.
• 7cfc622 Merge pull request #583 from hansfbaier/alientex_davincipro
• a6b8457 target/efinix_ti60_f225: Add L2 Cache (16KB for now) to improve perfs/Coremark.
• e4a15f6 targets/alinx_axau15: Remove unwanted add_sdcard() call.
• 949debb Merge remote-tracking branch 'origin/master' into alientex_davincipro
• e0e2bf8 add Alientek DaVinci Pro FPGA board
• 20e9bea Merge pull request #582 from hansfbaier/alientex_davincipro
• 110c051 add Alientek DaVinci Pro FPGA board
• Additional commits viewable in compare view

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