update FW to xx_2000_3298
update SAI to 1.16.0
update Spectrum-1 and Spectrum-2 buffer pool size according to the new SDK default config change.
modified: ../../device/mellanox/x86_64-mlnx_msn2700-r0/ACS-MSN2700/buffers_defaults_t0.j2
modified: ../../device/mellanox/x86_64-mlnx_msn2700-r0/ACS-MSN2700/buffers_defaults_t1.j2
modified: ../../device/mellanox/x86_64-mlnx_msn3700-r0/ACS-MSN3700/buffers_defaults_t0.j2
modified: ../../device/mellanox/x86_64-mlnx_msn3700-r0/ACS-MSN3700/buffers_defaults_t1.j2
modified: fw.mk
modified: mlnx-sai.mk
modified: mlnx-sai/SAI-Implementation
modified: sdk-src/sx-kernel/Switch-SDK-drivers
modified: sdk.mk
signed-off by kebol@mellanox.com