riscv: Kconfig.socs: Add ARCH_TENSTORRENT for Tenstorrent SoCs

Add Kconfig option ARCH_TENSTORRENT to enable support for SoCs like the
Blackhole.

Reviewed-by: Joel Stanley <jms@oss.tenstorrent.com>
Signed-off-by: Drew Fustini <dfustini@oss.tenstorrent.com>

Author: Drew Fustini

arch/riscv/Kconfig.socs

@@ -63,6 +63,14 @@ config ARCH_SUNXI
 	  This enables support for Allwinner sun20i platform hardware,
 	  including boards based on the D1 and D1s SoCs.
 
+config ARCH_TENSTORRENT
+	bool "Tenstorrent SoCs"
+	help
+	  This enables support for Tenstorrent SoC platforms.
+	  Current support is for Blackhole P100 and P150 PCIe cards.
+	  The Blackhole SoC contains four RISC-V CPU tiles each
+	  consisting of 4x SiFive X280 cores.
+
 config ARCH_THEAD
 	bool "T-HEAD RISC-V SoCs"
 	depends on MMU && !XIP_KERNEL